/*
        Masked Input plugin for jQuery
        Copyright (c) 2007-2011 Josh Bush (digitalbush.com)
        Licensed under the MIT license (http://digitalbush.com/projects/masked-input-plugin/#license) 
        Version: 1.3
*/
(function($) {
        var pasteEventName = ($.browser.msie ? 'paste' : 'input') + ".mask";
        var iPhone = (window.orientation != undefined);

        $.mask = {
                //Predefined character definitions
                definitions: {
                        '9': "[0-9]",
                        'a': "[A-Za-z]",
                        '*': "[A-Za-z0-9]"
                },
                dataName:"rawMaskFn"
        };

        $.fn.extend({
                //Helper Function for Caret positioning
                caret: function(begin, end) {
                        if (this.length == 0) return;
                        if (typeof begin == 'number') {
                                end = (typeof end == 'number') ? end : begin;
                                return this.each(function() {
                                        if (this.setSelectionRange) {
                                                this.setSelectionRange(begin, end);
                                        } else if (this.createTextRange) {
                                                var range = this.createTextRange();
                                                range.collapse(true);
                                                range.moveEnd('character', end);
                                                range.moveStart('character', begin);
                                                range.select();
                                        }
                                });
                        } else {
                                if (this[0].setSelectionRange) {
                                        begin = this[0].selectionStart;
                                        end = this[0].selectionEnd;
                                } else if (document.selection && document.selection.createRange) {
                                        var range = document.selection.createRange();
                                        begin = 0 - range.duplicate().moveStart('character', -100000);
                                        end = begin + range.text.length;
                                }
                                return { begin: begin, end: end };
                        }
                },
                unmask: function() { return this.trigger("unmask"); },
                mask: function(mask, settings) {
                        if (!mask && this.length > 0) {
                                var input = $(this[0]);
                                return input.data($.mask.dataName)();
                        }
                        settings = $.extend({
                                placeholder: "_",
                                completed: null
                        }, settings);

                        var defs = $.mask.definitions;
                        var tests = [];
                        var partialPosition = mask.length;
                        var firstNonMaskPos = null;
                        var len = mask.length;

                        $.each(mask.split(""), function(i, c) {
                                if (c == '?') {
                                        len--;
                                        partialPosition = i;
                                } else if (defs[c]) {
                                        tests.push(new RegExp(defs[c]));
                                        if(firstNonMaskPos==null)
                                                firstNonMaskPos =  tests.length - 1;
                                } else {
                                        tests.push(null);
                                }
                        });

                        return this.trigger("unmask").each(function() {
                                var input = $(this);
                                var buffer = $.map(mask.split(""), function(c, i) { if (c != '?') return defs[c] ? settings.placeholder : c });
                                var focusText = input.val();

                                function seekNext(pos) {
                                        while (++pos <= len && !tests[pos]);
                                        return pos;
                                };
                                function seekPrev(pos) {
                                        while (--pos >= 0 && !tests[pos]);
                                        return pos;
                                };

                                function shiftL(begin,end) {
                                        if(begin<0)
                                           return;
                                        for (var i = begin,j = seekNext(end); i < len; i++) {
                                                if (tests[i]) {
                                                        if (j < len && tests[i].test(buffer[j])) {
                                                                buffer[i] = buffer[j];
                                                                buffer[j] = settings.placeholder;
                                                        } else
                                                                break;
                                                        j = seekNext(j);
                                                }
                                        }
                                        writeBuffer();
                                        input.caret(Math.max(firstNonMaskPos, begin));
                                };

                                function shiftR(pos) {
                                        for (var i = pos, c = settings.placeholder; i < len; i++) {
                                                if (tests[i]) {
                                                        var j = seekNext(i);
                                                        var t = buffer[i];
                                                        buffer[i] = c;
                                                        if (j < len && tests[j].test(t))
                                                                c = t;
                                                        else
                                                                break;
                                                }
                                        }
                                };

                                function keydownEvent(e) {
                                        var k=e.which;

                                        //backspace, delete, and escape get special treatment
                                        if(k == 8 || k == 46 || (iPhone && k == 127)){
                                                var pos = input.caret(),
                                                        begin = pos.begin,
                                                        end = pos.end;
                                                
                                                if(end-begin==0){
                                                        begin=k!=46?seekPrev(begin):(end=seekNext(begin-1));
                                                        end=k==46?seekNext(end):end;
                                                }
                                                clearBuffer(begin, end);
                                                shiftL(begin,end-1);

                                                return false;
                                        } else if (k == 27) {//escape
                                                input.val(focusText);
                                                input.caret(0, checkVal());
                                                return false;
                                        }
                                };

                                function keypressEvent(e) {
                                        var k = e.which,
                                                pos = input.caret();
                                        if (e.ctrlKey || e.altKey || e.metaKey || k<32) {//Ignore
                                                return true;
                                        } else if (k) {
                                                if(pos.end-pos.begin!=0){
                                                        clearBuffer(pos.begin, pos.end);
                                                        shiftL(pos.begin, pos.end-1);
                                                }

                                                var p = seekNext(pos.begin - 1);
                                                if (p < len) {
                                                        var c = String.fromCharCode(k);
                                                        if (tests[p].test(c)) {
                                                                shiftR(p);
                                                                buffer[p] = c;
                                                                writeBuffer();
                                                                var next = seekNext(p);
                                                                input.caret(next);
                                                                if (settings.completed && next >= len)
                                                                        settings.completed.call(input);
                                                        }
                                                }
                                                return false;
                                        }
                                };

                                function clearBuffer(start, end) {
                                        for (var i = start; i < end && i < len; i++) {
                                                if (tests[i])
                                                        buffer[i] = settings.placeholder;
                                        }
                                };

                                function writeBuffer() { return input.val(buffer.join('')).val(); };

                                function checkVal(allow) {
                                        //try to place characters where they belong
                                        var test = input.val();
                                        var lastMatch = -1;
                                        for (var i = 0, pos = 0; i < len; i++) {
                                                if (tests[i]) {
                                                        buffer[i] = settings.placeholder;
                                                        while (pos++ < test.length) {
                                                                var c = test.charAt(pos - 1);
                                                                if (tests[i].test(c)) {
                                                                        buffer[i] = c;
                                                                        lastMatch = i;
                                                                        break;
                                                                }
                                                        }
                                                        if (pos > test.length)
                                                                break;
                                                } else if (buffer[i] == test.charAt(pos) && i!=partialPosition) {
                                                        pos++;
                                                        lastMatch = i;
                                                }
                                        }
                                        if (!allow && lastMatch + 1 < partialPosition) {
                                                input.val("");
                                                clearBuffer(0, len);
                                        } else if (allow || lastMatch + 1 >= partialPosition) {
                                                writeBuffer();
                                                if (!allow) input.val(input.val().substring(0, lastMatch + 1));
                                        }
                                        return (partialPosition ? i : firstNonMaskPos);
                                };

                                input.data($.mask.dataName,function(){
                                        return $.map(buffer, function(c, i) {
                                                return tests[i]&&c!=settings.placeholder ? c : null;
                                        }).join('');
                                })

                                if (!input.attr("readonly"))
                                        input
                                        .one("unmask", function() {
                                                input
                                                        .unbind(".mask")
                                                        .removeData($.mask.dataName);
                                        })
                                        .bind("focus.mask", function() {
                                                focusText = input.val();
                                                var pos = checkVal();
                                                writeBuffer();
                                                var moveCaret=function(){
                                                        if (pos == mask.length)
                                                                input.caret(0, pos);
                                                        else
                                                                input.caret(pos);
                                                };
                                                ($.browser.msie ? moveCaret:function(){setTimeout(moveCaret,0)})();
                                        })
                                        .bind("blur.mask", function() {
                                                checkVal();
                                                if (input.val() != focusText)
                                                        input.change();
                                        })
                                        .bind("keydown.mask", keydownEvent)
                                        .bind("keypress.mask", keypressEvent)
                                        .bind(pasteEventName, function() {
                                                setTimeout(function() { input.caret(checkVal(true)); }, 0);
                                        });

                                checkVal(); //Perform initial check for existing values
                        });
                }
        });
})(jQuery);


